Printing-plate holder



Nov. 17I 1925. 1,561,615

E. PALMER MNTING PLATE 110mm@` Filed June 173, 1925 2 Sheets-Sheet 1 0.O om. MQW@ G 0 o o QMUMO o a n w f @Lvo QMQR@ o Q o o @www WU oPatented Nov. 17, 1925.

lUNITED STATES EDWARD PALMER, OF BEXLEY, OHIO.

PRINTING-FLATE HOLDER.

Applcatonled June 13, 1925. Serial No. 36,845.

To all whom it may con cern:

Be it known `that I, EDwiinn PALMER, a citizen of the United States,residing at Bexley, in the county of Franklin and State of Ohio, haveinvented .certain new and useful Improvements in Printing-Plate Holders,of which the following is a specification.

The present invention is directed to improvements in printing plateholders.

The primary objectl of the invention is to provide a device ofthischaracter so constructed that the printing plates can be easily andquickly attached to or removed from the cylinder or adjusted thereon forprecise registration.

A further object of the invention is to provide a device of this kindconstructed in such manner that the printing plate clamps can besimultaneously released to permit adjustment thereof in order that theprinting plates may be adjusted in various positions upon the cylinder.

A still further object of the invention is to provide a device of thisnature so constructed that the printing plates can be adjusted with easeand precision and held irmly in their adj usted positions in a simpleand eiiicient manner, the adjusting operation being extremely simple andconsequently saving time and labor.

With these and other objects in view this invention resides in the novel`features of' construction, formation, combination and arrangement ofparts to be hereinafter more fully described, claimed and illustrated inthe accompanying drawings, in which Figure 1 is a fragmentary fiat planView of the cylinder.

Figure 2 is a transverse sectional View.

Figure 3 is a sectional view on line 3--3 of Figure 1. A

Figure 4 is a sectional view on line 4 4 of Figure 1.

Figure 5 is a sectional view on line 5-5 of Figure 2.

Figure 6 is a sectional view on line 6--6 of Figure 5. i

Figure 7 is a sectional view, showing the bolts released.

Figure 8 is a fragmentary detail view of the locking plate.

. Figure 9 is a perspective view of one of the locking plates.

Figure l() is a detail view of the draw bar locking mechanism.

teferring to the drawings, 1 designates the cylinder which is formedfrom a plurality of sections 2, preferably four in number. Thesesections are each provided with a plurality of rows of openings 3extending longitudinally of the cylinder.

Located within said sections are hubs 4, said hubs having radial ribs 5,in this instance four in number and having their terminals suitablysecured to the interior of the cylinder, there being shoulders 6 formedupon opposite sides of said ribs which form in conjunction with thecylinder wall guide grooves 7, the purpose of which will appear later.

Disposed between the respective ribs 5 of each section are independentlyactuated arcuate locking plates 8, the side edges of which are adaptedto engage the grooves 7 for limited sliding movement, said plates beingprovided with sockets 9 adapted for interlocking engagement with thelugs 10 of the respective draw bars 11, the inner edges of which areslidable inthe guide grooves l2 formed in the hubs 4, there being two igrooves and draw bars between each pair of ribs. The draw bars vary inlength, the shorter ones serving to slide the` outermost locking plates,while the longer ones actuate the innermost sections. These lockingplate are provided with a plurality of longitudinal rows of keyholeslots 13, corresponding in number to the openings 3. The longitudinalwalls of these slots are beveled, as at 14, and taper longitudinally soas to produce a wedging action when the locking plates are moved in onedirection.

In order to shift the draw bars 11, and thus the locking plates 8 whendesired each end of the cylinder has associated therewith bolts 15 whichare capable of being screwed inwardly or outwardly a suthcient distanceto slide the associated parts to perform their respective functions. Theheads 16 of these bolts arefcircular and are adapted to engage betweenthe wings 17 carried by the outer ends of the `draw bars 11 so that whenthe bolts are moved inwardly or outwardly the locking plates will becorrespondingly moved, as will be obvious. The heads 1G are providedwith wrench engaging heads 18 to facilitate the rotation of the bolts.The heads 16 are further provided with notches 19 adapted to be engagedby the pawls :20 suitably pivoted upon the ends of the cylinder, saidpawls serving, when engaged plates of the respective with the notches toprevent accidental rotation of the bolts in order to hold the lockingplates positively in their locked positions.

The printing plates 21 are of conventional form as are the clampingplates 22 therefor, with the exception that the latter are provided withtransverse beveled walled slots 23 to permit precise adjustment thereoCo-.operatively associated with the plates 22 are pins 24twhich havetheir beveled heads engaged in the slots 23 and their Shankslselectively engaged in the openings 3, said shanks being provided withannular grooves 25 and resultant annular shoulders 26. llhe shoulders 26are of such diameters that they can pass freely into or out ot thecircular portions ot the key-hole slots 13, but will be bindinglyengaged by the longitudinal portions ot said slots when the locs;- ingplates 3 are in their operative or locked positions.

Owing to the presence ol' the ribs 5 comparatively short pins 27 arerequired, said pins being otherwise identical with the pins 2st, saidpins being co-opera-tively associated with the longitudinal dovetailslots :formed in the sections 2 of the cylinder. 0ocupying the leasesof' the slots 23 are draw bars 29l and 30, varying in length andarranged side by side, said bars being provided respectively with openslots 31 and key-hole slots 31 adapte-d to co-operate with the pins 27as do the slots 13 with the pins 24, there being tiller strips 32engaged in the slots 28 which are; provided with openings 33 toraccommodating the pins 27.

rlhe adjacent ends ot the plates 8 are provided, respectively, with lugsand recesses 33 and 34 the recesses having open slots 35 therein whichco-operate with the lugs and function in the same manner with the pinsl27 as do the slots 13 with the pins 2-1.

To apply a printing plate to the cylinder'. the locking plates 8 areslid in a direction i o cause the circular portions of the slots 13 toregister with the openings 3, after which the clamping plates 22 aresuccessively adjusted in holding relation with the printingl plate,whereupon the pins 24 are dropped in the openings. Uponl rotating thedesired bolt 16 the associated locking plate 3 will slide to cause theshoulders 26 to ride upwardly upon the beveled walls 1li ot the slots13, thus drawing the pins inwardly and causing the hea-ds thereof tohold the clamping plates tightly engaged with the inargi-ns of theprinting plates at the desired points.

It will be obvious that by arranging the openings 3 as shown that theprinting plates 21 can be placed in any desired position upon thecylinder tor effective operation and proper registration during theprinting operation.

The draw bars 29 and 30 are shifted through the medium of the heads 35o1e the bolts 36, said bolts being arranged to operate in the samemanner as the heads 16 operate in connection with the draw bars 11.

YVhile l have shown my invention used in connection with a printingcylinder it will be ot course understood that by minor changes in theconstruction it can be used with equal success with flat or platenpresses.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art, without further description, and it will beunderstood that various changes in size, shape, proportion, and minorchanges in detail-s ot construction may be resorted to without departingfrom the spirit ot the invention.

ilhat is claimed is 1. The combination with a printing plate supporthaving a pluralityof openings therein, oit locking plates slidablyassociated therewith, clamping plates for the printing plate, meanspassable through the-clamping plates and engagcable with the lockingplates :l'or holding the clamping plates engaged with the printingplate, and means tor shitting the locking the purpose set forth.Y

2. 'l`he combination with a plate having a plurality of openings formedtherein, olf locking plates slidably engaged with the plate and havingslots therein, clamping plates upon the plate for engaging the printingplates, pins ing plates and openings for engagement in said slots, andmeans for sliding the locking plates to hold the clamping plates inbinding engagement with the printing plate.

3. ln a printing plate holder, the combination with a plate having aplurality of openings therein, oi' locking plates slidable under theplate, draw bars interlocked with the locking` plates, clamping )latesengaged with the printing` plate, pins passable through the clampingplates and openings for engagement with the locking plates, and meansfor sliding the draw bars and thus the locking plates to cause thelocking plates to hold the pins-in binding engagement withthe clampingplates, as and/tor the purpose set forth.

4. ln a printing plate holder, the combination with a plate having aplurality of openings therein, of a plurality of locking plates slidablyassociated with. the plate, clamping plates `for the printing plates,pins passable through the clamping plates and openings and engaged withthe locking plates to hold the clamping plates in binding engagementwith the printing plates, and means for sliding the lockingvplatesindependently.

5. ln, holder for printing plates, the combination with a cylinder, ot aplurality plates, as and for passable through the clamp- 100 of lookingplates slidably associated With the cylinder, clamping plates for theprinting plates, means passable through the clamping plates and cylinderfor engagement with the locking plates, draw bars connected with thelooking plates, adjustable devices upon the ends of the cylinder forselectively sliding the draw bars and thus the looking plates to causethe locking plates to aetuate the said means to hold the clamping platesengaged with the printing plates. a

G. In a holder for printing plates, the combination with a Cylinderhavlng a plurality of rows of openings therein, hubs located in thecylinder, locking plates slidahly associated with the hubs, draw barsinterloel-zed with the looking plates and slidable upon the hubs,clamping` plates for the printing plates, pins engaged in the olainpingplates and selected openings, said locking plates having slots thereinfor engagement With the pins to hold said pins in clamped engagementWith the clamping plates and the clamping plates engaged With theprinting plates, and means for sliding the draw bars to slide thelocking plates, as and for the purpose set forth.

7. In a holder for printing plates, the combination With a plate, of

a plurality of locking plates slidably associated with the plate,Clamping plates for the printing plates, pins engageable with theclamping plates and locking plates, and means for operating the lockingplates in reverse di reetions to cause the pins to bindingly hold orrelease the Clamping plates, as and for the purpose set forth.

ln testimony whereof I aix my signature.

EDVARD PALMER.

